Js.groups.empty.XXX translation keys - how are they used?

Looking at these new keys in Transifex - please help understand how they are used in the application:


js.groups.empty.posts

There is no post by members of this group.

js.groups.empty.members

There is no member in this group.

js.groups.empty.mentions

There is no mention of this group.

js.groups.empty.messages

There is no message for this group.

js.groups.empty.topics

There is no topic by members of this group.